"However, to save some time, lookup the Chipset name of your soundcard(s) on the ALSA Soundcard Matrix." This is incorrect. The chipset name will usually return the error 'unknown soundcard' upon attempting to emerge. Instead, the appropriate variable to put in the env ALSA_CARDS is the name after the 'module' argument in INSTALL link relevant to your soundcard. eg for mine this is 'sbawe' as opposed to 'emu8k' as the Gentoo Linux Alsa Guide would have me believe.
I fixed this in CVS. //ZhEN